<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>游戏房间</title>
    <link rel="stylesheet" href="css/common.css">
    <link rel="stylesheet" href="css/game_room.css">
</head>

<body>
    <div class="nav">⽹络五⼦棋对战游戏</div>
    <div class="container">
        <div id="chess_area">
            <!-- 棋盘区域, 需要基于 canvas 进⾏实现 -->
            <canvas id="chess" width="450px" height="450px"></canvas>
            <!-- 显⽰区域 -->
            <div id="screen"> 等待玩家连接中... </div>
        </div>
        <div id="chat_area" width="400px" height="300px">
            <div id="chat_show">

            </div>
            <div id="msg_show">
                <input type="text" id="chat_input">
                <button id="chat_button">发送</button>
            </div>
        </div>
    </div>
    <script>
        var is_me; 
        var room_info = null;

        var ws_url = "ws://" + location.host + "/room"; 
        var ws_hdl = new WebSocket(ws_url);
        
        let chessBoard = [];
        let BOARD_ROW_AND_COL = 15;
        let chess = document.getElementById('chess');
        //获取chess控件区域2d画布
        let context = chess.getContext('2d');
        function initGame() {
            initBoard();
            // 背景图⽚
            let logo = new Image();
            logo.src = "image/sky.jpg";
            logo.onload = function () {
                // 绘制图⽚
                context.drawImage(logo, 0, 0, 450, 450);
                // 绘制棋盘
                drawChessBoard();
            }
        }
        function initBoard() {
            for (let i = 0; i < BOARD_ROW_AND_COL; i++) {
                chessBoard[i] = [];
                for (let j = 0; j < BOARD_ROW_AND_COL; j++) {
                    chessBoard[i][j] = 0;
                }
            }
        }
        // 绘制棋盘⽹格线
        function drawChessBoard() {
            context.strokeStyle = "#BFBFBF";
            for (let i = 0; i < BOARD_ROW_AND_COL; i++) {
                //横向的线条
                context.moveTo(15 + i * 30, 15);
                context.lineTo(15 + i * 30, 430);
                context.stroke();
                //纵向的线条
                context.moveTo(15, 15 + i * 30);
                context.lineTo(435, 15 + i * 30);
                context.stroke();
            }
        }
        //绘制棋⼦
        function oneStep(i, j, isWhite) {
            if (i < 0 || j < 0) return;
            context.beginPath();
            context.arc(15 + i * 30, 15 + j * 30, 13, 0, 2 * Math.PI);
            context.closePath();
            //createLinearGradient() ⽅法创建放射状/圆形渐变对象
            var gradient = context.createRadialGradient(15 + i * 30 + 2, 15 +
                j * 30 - 2, 13, 15 + i * 30 + 2, 15 + j * 30 - 2, 0);
            // 区分⿊⽩⼦
            if (!isWhite) {
                gradient.addColorStop(0, "#0A0A0A");
                gradient.addColorStop(1, "#636766");
            } else {
                gradient.addColorStop(0, "#D1D1D1");
                gradient.addColorStop(1, "#F9F9F9");
            }
            context.fillStyle = gradient;
            context.fill();
        }
        //棋盘区域的点击事件
        chess.onclick = function (e) {
            if(!is_me)
            {
              //未轮到自己下棋 
             return;
            }
            let x = e.offsetX;
            let y = e.offsetY;
            // 注意, 横坐标是列, 纵坐标是⾏
            // 这⾥是为了让点击操作能够对应到⽹格线上
            let col = Math.floor(x / 30);
            let row = Math.floor(y / 30);
            if (chessBoard[row][col] != 0) {
                alert("当前位置已有棋⼦！");
                return;
            }
            
            send_chess(row,col);

        }
        
        function send_chess(r,c) 
        {
          var chess_info = 
            {
              optype : "put_chess", 
              room_id : room_info.room_id , 
              uid : room_info.uid, 
              row : r,
              col : c
            };

          ws_hdl.send(JSON.stringify(chess_info));
           console.log("click:" + JSON.stringify(chess_info));
        }

        window.onbeforeunload = function()
        {
            ws_hdl.close();
        }
        ws_hdl.onopen = function()
        {
            console.log("房间长连接建立成功");
        }
        ws_hdl.onclose = function()
        {
            console.log("房间长连接断开");
        }
        ws_hdl.onerror = function()
        {
            console.log("房间长连接出错");
        }


        function set_screen(me){
          var screen_div = document.getElementById("screen");
          if(me)
          {
            screen_div.innerHTML = "轮到己方走棋";
          }
          else {
            screen_div.innerHTML = "轮到对方走棋";
          }
        }
        ws_hdl.onmessage = function(evt)
        {
            //1将房间信息保存起来 
            var info = JSON.parse(evt.data);
            if(info.optype == "room_ready")
            {
              room_info = info ;
              is_me = room_info.uid == room_info.white_id ? true : false; 
              set_screen(is_me); 
              initGame();
            }
            else if(info.optype == "put_chess")
            {
               //走棋操作
              //1.收到走棋消息，正常则走棋 
              if(info.result == false) 
              {
                console.log(info.reason);
                return; 
              }
              //绘制棋子
              is_me = room_info.uid  == info.uid ? false : true; 
              var IsWhite = room_info.white_id == info.uid ? true : false ;
              if(info.col != -1 && info.row != -1)
              {
                oneStep(info.col, info.row, IsWhite);
                //设置棋盘信息 
                chessBoard[info.row][info.col] = 1 ;
                set_screen(is_me); 
              }
              //是否有胜利者 
              if(info.winner == 0)
              {
                return ; 
              }

              var screen_div = document.getElementById("screen");
              if(room_info.uid == info.winner)
              {
                screen_div.innerHTML = info.reason; 
              }else 
              {
                screen_div.innerHTML = "你输了，再接再厉"; 
              }

              //创建返回大厅按钮
              var chess_area_div = document.getElementById("chess_area");
              var button_div = document.createElement("div"); 
              button_div.innerHTML = "返回大厅"; 
              //新建按钮点击事件 
              button_div.onclick = function(){
                location.replace("/game_hall.html");
              }
              chess_area_div.appendChild(button_div);
            }else if(info.optype == "chat")
            {
                var msg_div = document.createElement("p"); 
                var br_div = document.createElement("br");
                var msg_show_div = document.getElementById("chat_show");
                if(info.result == false)
                {
                    if(room_info.uid == info.uid)
                    {
                        msg_div.innerHTML = "你输入的内容违规";
                        msg_div.setAttribute("id", "self_msg");
                        msg_show_div.appendChild(msg_div);
                        msg_show_div.appendChild(br_div);
                        document.getElementById("chat_input").value = "";
                    }
                    return;
                }
                msg_div.innerHTML = info.message;
                if(room_info.uid == info.uid) 
                {  
                    msg_div.setAttribute("id", "self_msg");
                    document.getElementById("chat_input").value = "";
                }else 
                {
                    msg_div.setAttribute("id", "peer_msg");
                }
                msg_show_div.appendChild(msg_div);
                msg_show_div.appendChild(br_div);

            }else 
            {
                console.log("未知请求");
            }
        }


        var chat_button = document.getElementById("chat_button"); 
        //消息发送点击事件
        chat_button.onclick = function()
        {
            var input_msg = document.getElementById("chat_input"); 
            var send_msg = {
                optype : "chat", 
                message : input_msg.value , 
                room_id : room_info.room_id , 
                uid : room_info.uid
            };
            //发送
            ws_hdl.send(JSON.stringify(send_msg));
        }

    </script>
</body>

</html>
